PHP redirect timeout

[Dave]

Hi All,

Can anyone suggest a reliable solution to php redirect?:

header("Locatio n: $redir_url");
if the above times out in $timeout seconds
header("Locatio n: $alt_redir_url" );

Many thanks,

Dave

[Jerry Stuckle]

Re: PHP redirect timeout

Dave wrote:[color=blue]
> Hi All,
>
> Can anyone suggest a reliable solution to php redirect?:
>
> header("Locatio n: $redir_url");
> if the above times out in $timeout seconds
> header("Locatio n: $alt_redir_url" );
>
> Many thanks,
>
> Dave
>
>[/color]

Hi, Dave,

Sorry, you can't do it.

When you send the redirect, the request goes to the browser. The browser is now
responsible for fetching the new page. Your script is no longer "in the loop".

Maybe you could do it with javascript - I haven't tried. But that would have
its own problems (i.e. user has disabled javascript).

--
=============== ===
Remove the "x" from my email address
Jerry Stuckle
JDS Computer Training Corp.
jstucklex@attgl obal.net
=============== ===

[Karl Groves]

Re: PHP redirect timeout

Jerry Stuckle <jstucklex@attg lobal.net> wrote in
news:ZsGdnYorq-4TNrTZ4p2dnA@co mcast.com:
[color=blue]
> Dave wrote:[color=green]
>> Hi All,
>>
>> Can anyone suggest a reliable solution to php redirect?:
>>
>> header("Locatio n: $redir_url");
>> if the above times out in $timeout seconds
>> header("Locatio n: $alt_redir_url" );
>>
>> Many thanks,
>>
>> Dave
>>
>>[/color]
>
> Hi, Dave,
>
> Sorry, you can't do it.
>
> When you send the redirect, the request goes to the browser. The
> browser is now responsible for fetching the new page. Your script is
> no longer "in the loop".
>
> Maybe you could do it with javascript - I haven't tried. But that
> would have its own problems (i.e. user has disabled javascript).
>[/color]

Actually, what could be done is to check for a good response at new URL
with fsockopen() and if successful, do the redirect, otherwise go to the
alternate.

To the OP:
peruse the info here: http://us2.php.net/function.fsockopen



--
Karl Groves

http://karlcore.com

http://chevelle.karlcore.com

Accessibility Discussion List: http://smallerurl.com/?id=6p764du

[Dave]

Re: PHP redirect timeout

Actually, what I ended up doing was to use curl to request a very small
graphic from the site.
Used curl timeout to control the redirect time and got just the header.

$timeout = 10;
$testurl = "www.example.co m/small.gif";

$ch = curl_init();
curl_setopt($ch , CURLOPT_HEADER, 1);
curl_setopt($ch , CURLOPT_NOBODY, 1);
curl_setopt($ch , CURLOPT_URL,$te sturl);
curl_setopt($ch , CURLOPT_RETURNT RANSFER,1);
curl_setopt($ch , CURLOPT_TIMEOUT , $timeout);
$source = curl_exec($ch);
curl_close($ch) ;

if ($source!="") // optionally I could have tested for HTTP status, 404,
301, etc.
$url = "http://www.example.com/";
else
$url = "http://www.example.net/";
header("Locatio n: $url");

Thanks to all who responded,

Dave


"Karl Groves" <karl@NOSPAMkar lcore.com> wrote in message
news:Xns9794A94 E12584karlkarlc orecom@216.196. 97.136...[color=blue]
> Jerry Stuckle <jstucklex@attg lobal.net> wrote in
> news:ZsGdnYorq-4TNrTZ4p2dnA@co mcast.com:
>[color=green]
>> Dave wrote:[color=darkred]
>>> Hi All,
>>>
>>> Can anyone suggest a reliable solution to php redirect?:
>>>
>>> header("Locatio n: $redir_url");
>>> if the above times out in $timeout seconds
>>> header("Locatio n: $alt_redir_url" );
>>>
>>> Many thanks,
>>>
>>> Dave
>>>
>>>[/color]
>>
>> Hi, Dave,
>>
>> Sorry, you can't do it.
>>
>> When you send the redirect, the request goes to the browser. The
>> browser is now responsible for fetching the new page. Your script is
>> no longer "in the loop".
>>
>> Maybe you could do it with javascript - I haven't tried. But that
>> would have its own problems (i.e. user has disabled javascript).
>>[/color]
>
> Actually, what could be done is to check for a good response at new URL
> with fsockopen() and if successful, do the redirect, otherwise go to the
> alternate.
>
> To the OP:
> peruse the info here: http://us2.php.net/function.fsockopen
>
>
>
> --
> Karl Groves
> http://karlcore.com
> http://chevelle.karlcore.com
>
> Accessibility Discussion List: http://smallerurl.com/?id=6p764du[/color]

[Jerry Stuckle]

Re: PHP redirect timeout

Dave wrote:[color=blue]
> Actually, what I ended up doing was to use curl to request a very small
> graphic from the site.
> Used curl timeout to control the redirect time and got just the header.
>
> $timeout = 10;
> $testurl = "www.example.co m/small.gif";
>
> $ch = curl_init();
> curl_setopt($ch , CURLOPT_HEADER, 1);
> curl_setopt($ch , CURLOPT_NOBODY, 1);
> curl_setopt($ch , CURLOPT_URL,$te sturl);
> curl_setopt($ch , CURLOPT_RETURNT RANSFER,1);
> curl_setopt($ch , CURLOPT_TIMEOUT , $timeout);
> $source = curl_exec($ch);
> curl_close($ch) ;
>
> if ($source!="") // optionally I could have tested for HTTP status, 404,
> 301, etc.
> $url = "http://www.example.com/";
> else
> $url = "http://www.example.net/";
> header("Locatio n: $url");
>
> Thanks to all who responded,
>
> Dave
>
>
> "Karl Groves" <karl@NOSPAMkar lcore.com> wrote in message
> news:Xns9794A94 E12584karlkarlc orecom@216.196. 97.136...
>[color=green]
>>Jerry Stuckle <jstucklex@attg lobal.net> wrote in
>>news:ZsGdnYor q-4TNrTZ4p2dnA@co mcast.com:
>>
>>[color=darkred]
>>>Dave wrote:
>>>
>>>>Hi All,
>>>>
>>>>Can anyone suggest a reliable solution to php redirect?:
>>>>
>>>>header("Loc ation: $redir_url");
>>>>if the above times out in $timeout seconds
>>>>header("Loc ation: $alt_redir_url" );
>>>>
>>>>Many thanks,
>>>>
>>>>Dave
>>>>
>>>>
>>>
>>>Hi, Dave,
>>>
>>>Sorry, you can't do it.
>>>
>>>When you send the redirect, the request goes to the browser. The
>>>browser is now responsible for fetching the new page. Your script is
>>>no longer "in the loop".
>>>
>>>Maybe you could do it with javascript - I haven't tried. But that
>>>would have its own problems (i.e. user has disabled javascript).
>>>[/color]
>>
>>Actually, what could be done is to check for a good response at new URL
>>with fsockopen() and if successful, do the redirect, otherwise go to the
>>alternate.
>>
>>To the OP:
>>peruse the info here: http://us2.php.net/function.fsockopen
>>
>>
>>
>>--
>>Karl Groves
>>http://karlcore.com
>>http://chevelle.karlcore.com
>>
>>Accessibili ty Discussion List: http://smallerurl.com/?id=6p764du[/color]
>
>
>[/color]

All this does is mean you can access it from your site at that time.

It doesn't mean, for instance, the user can access it - there may be a
communications problem somewhere between the user and the target site, for instance.

And of course there's the slight chance the site will go down between the time
you request the graphic and the time the redirect takes effect. But the odds of
that happening are pretty remote unless you're doing hundreds of redirects per
minute.

--
=============== ===
Remove the "x" from my email address
Jerry Stuckle
JDS Computer Training Corp.
jstucklex@attgl obal.net
=============== ===

[Chung Leong]

Re: PHP redirect timeout

Jerry Stuckle wrote:[color=blue]
>
> Maybe you could do it with javascript - I haven't tried. But that would have
> its own problems (i.e. user has disabled javascript).
>[/color]

It can't really be done reliably in Javascript either, with cross-site
scripting restrictions keeping you from detecting the state of the
target site. All I think can of is to link to a image on the target
site, then check to see if its dimensions are corrected. That obviously
wouldn't work if the image happens to be sitting in the browser cache.